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  • 1985-1989  (3)
  • 1985  (3)
Source
Material
Years
  • 1985-1989  (3)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Spin resonance in EuxSr1−xS with x=0.4, 0.5, and 0.54 (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 3488-3490 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Electron spin resonance has been studied in single crystal spheres of EuxSr1−xS with samples of nominal composition x=0.4, 0.5, and 0.54. The emphasis has been on the field for resonance of x=0.4 material at 11.65 GHz at temperatures between 4.2 and 1.65 K. Even at the lowest temperatures the lines do not vary with crystal orientation. In all samples there is a depression of the field for resonance beginning at about 10 K, and increasing to the lowest temperatures. This is interpeted as an "internal'' field Hi. Measurements at 17 GHz reveal that Hi for all three compositions decreases with increasing frequency. Surprisingly, at 1.65 K, this seems to vary with sphere size for the x=0.4 composition. In addition to the experiments on spheres, a small plate-shaped specimen of x=0.4 was studied. It too showed a large depression of the field for resonance at 1.75 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335035
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Intrinsic anisotropy of Tb-Fe films prepared by magnetron Co sputtering (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 3897-3899 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Amorphous Tb-Fe thin films have been produced by dual-gun dc magnetron cosputtering, which allows a moderate range of compositions (spanning about 20 at. %) to be deposited in a single run under identical conditions. The films exhibit clean M-H loops and torque curves which are somewhat anomalous but show consistent trends. Films deposited at room temperature with a composition in the range 17–30 at. % Tb showed a positive intrinsic anisotropy of roughly 3×106 erg/cm3, resulting in an easy axis of magnetization that is perpendicular to the plane of the film, while films with 〉37 at. % Tb had a small negative intrinsic anisotropy (ca. −2×105 erg/cm3). The temperature dependence of the anisotropy indicates that neither uniaxial stress nor shape anisotropy can account for most of the intrinsic uniaxial anisotropy observed, so we hypothesize that the large anisotropy must be due to pair ordering or a local anisotropy field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.334908
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Aging effects on amorphous Tb–transition-metal films prepared by diode and magnetron sputtering (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 3900-3902 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have studied and compared the aging characteristics of the amorphous Tb(FeCo) films from both dc getter diode and magnetron sputtering. No protecting layer such as SiO2 or Al2O3 was put on the films. Fresh films of 1.0-μm thickness from diode sputtering showed a perpendicular anisotropy and well-behaved magnetic properties using a vibrating sample magnetometer and an automatic torque magnetometer. We noticed a decrease in perpendicular anisotropy when the films were exposed to the air. However, this aging phenomenon was not observed in films of the same thickness prepared by magnetron sputtering even after seven months' exposure to the air. The reasons for the difference are due to two distinct reaction mechanisms: bulk reaction in diode-sputtered films and surface reaction in magnetron-sputtered films. A variation of the microstructure is believed to attribute to this. The surface reaction was studied in thinner magnetron-sputtered films of 10 and 25 nm, where the surface-to-bulk ratio is larger. A decrease in perpendicular anisotropy with aging was observed in these thinner films.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.334909
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    Paper (German National Licenses)
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